Heel attaching machine



Jdn. 10, 1950 SMALL 2,494,494

HEEL ATTACHING MACHINE Filtd May 16, 1947 3 Sheets-Sheet lIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIQ j/w s/vme. Hy EDNA/8D5.5mm

BY A TOR/V5) Jan. 10, 1950 Filed y 16, 1947 E. F. SMALL HEEL ATTACHINGMACHINE 3 Shets-Sheet 2 EDWARD/Y MALL Jan. 10, 1950 E. F. SMALL HEELATTACHING momma 3 Sheets-Shee't'li Filed May 16, 1947 4 h u m WU. a A Hw u i m t F 3 m a F M Y D rl MM F v. j p I, B 6 .A 9 (a, n a x E, a M xs 1 m M a l I z Patented Jan. 1950 HEEL ATTACHING MACHINE Edward F.Small, Newton, Mass., assignor to Compo Shoe Machinery Corporation,Boston, Mass., a corporation of Delaware Application May 16, 1947,Serial No. 748,380

7Claims. 1

This invention relates to screw inserting machines and more particularlyto a machine for securing heels to shoes.

It is customary to initially secure a heel to a shoe, while the shoe ismounted upon its original last, by drilling a lead hole through the heelseat of the shoe and into the positioned heel and thereafter driving awoodscrew into the hole to draw the parts together.

Attempts have been made to drive a screw into the shoe and heel withoutfirst forming a lead hole and I have found that this practice is verysatisfactory providing the body diameter of the woodscrew is smallerthan that of the screws generally used when a lead hole is formed.

A general object of this invention is to provide an improved machine forsecuring heels to shoes by means of woodscrews, while the shoes aremounted upon their original lasts, which is simple in construction,rapid and simple to operate, and which reduces the cost of suchoperation while increasing the output per machine.

Another object of the invention is to provide a screw inserting machinewhich is largely automatic in operation and which, when used withprepared lasts, will drive the woodscrews to a definite depth withoutmarring the screw heads.

A further object of the invention is to Provide a screw insertingmachine having a single screw driving spindle which is rotated in ascrew driving direction to cause it to be moved towards the work and ina reverse direction to move it away from the work thus obviating thenecessity of expensive stop mechanisms.

A still further object of the invention is to provide a screw insertingmachine having a screw driving spindle construction which allowsrotation of the spindle to be reversed when the screw has been driven tothe desired depth, the screw driver to be moved away from the work andto be held non-rotative until it is withdrawn from its drivingconnection with the screw driven into the work.

Other objects of the invention will in part be obvious and will in partappear hereinafter.

The invention accordingly comprises the features of construction,combination of elements, and arrangement of parts which will beexemplified in the construction hereinafter set forth and the scope ofthe invention will be indicated in the claims.

For a fuller understanding of the nature and objects of the inventionreference should be had to the following detailed description taken in 2connection with the accompanying drawing, in which:

Fig. 1 is a front elevation, partly in section, of a screw insertingmachine embodying features of my invention;

Fig. 2 is a side elevation, partly in section, of

the machine;

Fig. 3 is a partial sectional plan view taken along lines 3-3 of Fig. 2;

Fig. 4 is a fragmentary sectional view showing the last thimble mountedupon the last support and the spindle in position ready to drive ascrew;

Fig. 5 is a fragmentary plan view taken along lines 5--5 of Fig. 4;

Fig. 6 is a fragmentary view, partly in section, similar to Fig. 4 butshowing the screw driver spindle starting to drive a screw into the shoeand heel;

Fig. '7 is a view similar to Fig. 6 but showing the screw driver spindleafter its rotation has been reversed and the screw driver disengagedfrom driving connection with the screw driven into the shoe and heel;

Fig. 8 is a schematic wiring diagram of the electrical elements of amachine; and,

Fig. 9 is a fragmentary plan view taken substantially along line 9-9 ofFig. 2.

Referring to the drawing, there is shown a machine for attaching heelsto shoes the general construction of which is similar in many respectsto the machine described in my co-pending application Serial No.695,431, filed in the United States Patent Office on September '7, 1946,now Patent No. 2,449,333 issued September 14, 1948.

The machine of this invention comprises a base casting Hi to which thetop casting II is secured by the bolts H to form a frame to support andhouse the machine mechanism.

The underside of the top casting l l is provided with a depending bossI3 to which a bracket I4 is secured by the screws l5. An extension ofthe bracket terminates to form a boss l6 which is bored to receive abushing I! in which the lower end of the screw-driver spindle I8 isjournalled.

The upper end of the screw-driver spindle is journalled in a bushing I!which is pressed into a cap 20 secured by the screws 2| to the undersideof the top casting H in alignment with a bore formed therein and thehollow last supporting pin 22 is secured by the screws 23 to the upperside of the top casting in alignment 3 cured thereto is belted to apulley driven by the shaft of an electric motor 25 which is secured tothe base casting.

The screw-driver spindle is also adapted to be reciprocated and this iseffected by and is dependent upon rotation of the spindle.

As best shown in Figs. 2 and 3, a worm 21 is keyed to the spindle I8 andis held in place by the collars 28 and 29 against which the inner racesof the ball bearings 58 and 8| are jammed by the lock nuts 22 and 32threaded to the spindle.

The outer races of'the ball bearings fit within vertical bores formed ina gear housing 24 which is forced to partake of any reciprocatingmovement of the spindle due to the outer race 01' the ball bearing 80being locked against the shoulder 35 of the gear housing by the cap 58.

The gear housing 34 is prevented from rotating with the spindle I8 by akey 31 which is formed integral with the housing and which fits andslides in a spline 38 formed in the bracket I4.

The gear housing is also provided with the horizontally extending bores38 in which is journalled a shaft 40 having a worm wheel gear 4I keyedthereto which meshes with and is rotated by the worm 21. The shaft 40extends from each end of the gear housing and set screwed to eachextension is a crank disc 42 having threaded thereto a crank pin 43.With this construction the cranks revolve as long as the spindle I8 isrotated.

Each side of the bracket I4 is provided with a horizontally extendingshelf like portion 44 and secured therein are wear plates 45 which areengaged by the crank pins 43 thus causing the entire gear housing andspindle to be moved when the spindle I8 is rotated.

A cylindrical clutch portion 46 is secured by a taper pin 41 to theupper end of the spindle I8 and is internally threaded with a left handthread of coarse pitch. As shown in Figs. 4, 5 and 6, the upper surfaceof the clutch portion is cut away to leave an upstanding segment 48which engages with a dog pin 49 extending from the screw driver shaft 50which threads into the clutch section.

The screw-driver bit 5| is threaded into the shaft so that the bit caneasily be replaced.

The last L upon which the shoe S is mounted,

and all lasts intended for use with the machine are provided with ascrew receiving recess in the form of a metal last thimble T which Ispressed into the last and seats against a washer W having an opening ofsmaller diameter than the thimble so as to provide a shoulder to engageagainst the top of the last-supporting pin 22 and to take the heelclamping pressure. Regardless of the size of the last, the washer W islocated a definite distance away from the heel seat portion and, as willbe later understood, this allows the heel attaching screw F to be drivento a definite depth.

The heel clamping device comprises a heel engaging member 52 which isswingably mounted upon the pivot ends of the screws 53 which arethreaded into the U-shaped ends 54 of the arm 55. The other end of thearm 55 is bifurcated to fit over a lever 55 and is pivoted thereto at51. A screw 58 prevents the arm from moving with respect to the leverwhile clamping a shoe and also serves to adjust the position of the armto accommodate different styles of heels.

The lever 55 is pivoted at 59 to the bifurcated end of a plunger 60which is freely movable in a bore 8| formed in the bracket I4. Theplunger 4 has portion 52 of reduced diameter which passes through a hole88 formed in line with the bore 8| and a compression spring 84 serves toupwardly bias the plunger, the lever 58 and its associated parts.

The nut 85 serves to limit the extent that the plunger can be raisedunder the influence of the spring 54.

The horizontally disposed end 85 of the lever 58 is bifurcated tostraddle the spindle I8 and gear housing 24 and each leg of the lever ispivotally joined to a treadle rod connector 81 by the clevis pins 58.The upper ends of the treadle rods 58 are screw threaded into theconnectors 51 and the lower ends are threaded into the clevises 10 whichare pivotally connected to a rod H extending from and crosswise to thetreadle 12.

The treadle 12 is pivotally mounted upon the shaft 13 held by thebracket 14 secured to the base casting In by the bolts 15.

When the treadle 12 is in its upper position the arm 55 is in a positionremote from the last supporting pin 22, as shown by dot dash lines inFig. 2, and allows the shoe and last to be placed easily upon the pin.

In operation of the machine, the operator drops a woodscrew F,preferably of the recessed head type, head down into the hollow lastsupporting pin 22 where it comes to a rest upon and centers with thescrew driver bit 5|. A shoe with its last is placed upon the last pin,the heel is positioned and the treadle 12 depressed which first causesthe lever 55 to move about its pivot until the heel engaging member 52contacts the heel. Further depression of the treadle overcomes the biasof the spring 54 and the complete heel clamp moves downwardly to clampthe heel H to the shoe S and the last is firmly pressed downwardly untilthe washer W within the last is pressed against the top of the lastsupporting pin 22. The heel clamp is prevented from moving rearwardly bythe pin 16 which is pressed into the lever 55 and which engages againstthe block 11 screwed to the top casting as shown in Figs. 2 and 9.

When the heel is clamped, the operator depresses the button 18 of aswitch 19 which, as shown in Fig. 8, energizes the coil of a magneticcontactor to start the motor 26 and this causes the spindle I 8 to berotated in a screw driving direction. As the spindle is rotated it isalso moved towards the shoe and heel as the crank pins 45 press againstthe wear plates on the bracket I4 and cause the complete gear housing 34to lift.

Since the threaded connection between the screw driver shaft 50 and theclutch section 48 is of opposite hand to the screw to be driven, theshaft 50 does not rotate during a portion of the first revolution of thespindle I8 but is simply elevated until the dog pin 49 is engaged by thesegment 48 on the clutch section which acts as a driver.

After engagement of the dog pin with the clutch section segment 48, thespindle I8 and the screw driver shaft and bit continue to rotate and bemoved upwardly as a unit and the screw F is driven into the shoe andheel.

When the screw is driven to the correct depth into the shoe and heel.rotation of the spindle I8 is reversed. This is accomplished by a doublepole double throw switch 8| which is held upon a bracket 82 bolted tothe base casting I0 and which is actuated by the collars 83 which areadjustably secured to a rod 84 threaded and locked to a plate 85extending-from the cap 36 on the gear housing 34.

When the rotation of the spindle I8 is reversed, the screw driver shaft50 does not rotate as it simply threads into the clutch section 46 untilthe crank pins 43 have rotated suflicient to allow the gear housing andspindle to lower an amount sufficient to allow the screw driver bit todisengage from its driving connection with the screw head as indicatedby Fig. 7. After the screw driver bit has cleared the screw head, itagain rotates with the spindle I8.

As the gear housing reaches its lowest position the reversing switch 8|is again actuated and as the operator hears its action he allows thebutton 18 of the switch 19 to be released and the motor is deenergized.

The foot treadle is released and the shoe with its attached heel isremoved and the machine remains ready to operate upon another shoe.

Since certain changes may be made in the above construction anddifferent embodiments .of the invention could be made withoutdeparting'from the scope thereof, e. g., a pawl and ratchet or other oneway clutch device could be substituted for the threaded connectionbetween the screw driver spindle l8 and the screw driver shaft 50, it isintended that all matter contained in the above description 0r shown inthe accompanying drawing shall be interpreted as illustrative and not ina limiting sense.

It is also to be understood that the following claims are intended tocover all of the generic and specific features of the invention hereindescribed, and all statements of the scope of the invention which, as amatter of language, might be said to fall therebetween.

Having described my invention, what I claim as new and desire to secureby Letters Patent, is:

1. In a screw inserting machine, a work support, a rotatable spindle, ascrew driver mounted upon said spindle, means for rotating said spindleand screw driver in a screw driving direction and for moving suchassembly towards said work support, means for reversing the direction ofrotation of said spindle and for allowing it to move away from said worksupport, and means for preventing reverse rotation of the screw drivermounted upon said spindle until said spindle has moved away from saidwork support a distance suflicient to disengage said screw driver fromdriving engagement with a screw.

2. In a screw inserting machine, a work support, a rotatable spindle, ascrew driver mounted upon said spindle and rotatable therewith through alost motion connection, means for rotating said spindle and screw driverin a screw driving direction and for moving such assembly towards saidwork support, and means for reversing rotation and movement of saidspindle when it has moved towards said work support a distancesufficient to drivea screw into work held thereto, whereby said lostmotion connection between said spindle and said screw driver will allowsaid screw driver to be held nonrotative during reverse rotation of saidspindle until said spindle has moved away from said work support adistance sufficient to withdraw said screw driver from drivingengagement with the screw driven into the work.

3. In a screw inserting machine, a work support, a rotatable spindle. ascrew driver mounted upon said spindle and rotatable therewith through aone-way clutch, means for rotating said spindle and screw driver in ascrew driving direction and for moving such assembly towards said worksupport, and means for reversing rotation and movement of said spindlewhen it has moved towards said work support a distance suflicient todrive a screw into work held thereto, whereby said one-way clutch willallow said screw driver to be held non-rotative durin reverse rotationof said spindle until said spindle has moved away from said work supporta distance sufficient to withdraw said screw driver from drivingengagement with the screw driven into the work.

4. In a screw inserting machine, a work support, a. rotatable spindle, ascrew driver, said screw driver being rotatably threaded to one end ofsaid spindle with a thread having a helix rotation opposite to that ofthe screws to be driven, means for limiting rotation of said screwdriver with respect to said spindle, means for rotating said spindleand-said screw driver in a screw driving direction and for moving suchassembly towards said work support, and means for reversing rotation andmovement of I said spindle when it has moved towards said work support adistance sufficient to drive a screw into work held thereto, wherebysaid screw driver will be held non-rotative during reverse rotation ofsaid spindle until it is moved away from said work support a distancesuflicient to withdraw it from driving engagement with the screw driveninto the work.

5. In a heel attaching machine, the combination comprising, a frame, ahollow last pin mounted upon said frame, means for clamping a heel to ashoe on a last supported by said last pin, a screw driving spindle inalignment with said last pin, power operated means for rotating saidspindle in a screw driving direction, means dependent upon rotation ofsaid spindle in a screw driving direction for moving it towards and todrive a screw into the shoe and heel supported by said last pin, andautomatically operated means for reversing the direction of rotation ofsaid spindle and for moving it away from the shoe and heel supported bysaid last pin.

6. In a heel attaching machine, the combination comprising, a frame, ahollow last pin mounted upon said frame, means for clamping a heel to ashoe on a last supported by said last pin, a rotatable spindle inalignment with said last pin, a screw driver held to said spindle, meansfor rotating said spindle and said screw driver in a screw drivingdirection and for moving said spindle towards the shoe and heelsupported by said last pin to drive a screw therein, means for reversingthe direction of rotation of said spindle and for moving it away fromthe shoe and heel, and means for preventing reverse rotation of saidscrew driver until said spindle has moved away from the shoe and heel adistance sufficient to withdraw said screw driver from drivingengagement with the screw driven therein.

'7. In a heel attaching machine, the combination comprising, a frame, ahollow last pin mounted upon said frame, means for clamping a heel to ashoe on a last supported by said last pin, a housing slidable on saidframe, a screw driver spindle journalled in said housing, one end ofsaid spindle extending into said hollow last pin, a screw driverrotatably secured to the end of said spindle extending into said hollowlast pin. means for limiting rotation of said screw driver with re spectto said spindle, a shaft journalled in said housing and extending at aright angle to said spindle, gearing connecting said shaft and said 8spindle, means for rotating said spindletin a screw REFERENCES CITEDdriving direction, a crank mounted on he end of said shaft, meansengaging said crank to cause fig' figmigg are of record m the saidhousing and spindle to move towards the heel clamped to the shoesupported by said hollow last UNITED STATES PATENTS pin as said spindleis rotated, means for reversing V the direction of rotation and movementof said agi: gi 1945 spindle, when it has moved towards the heel adistance s uflicient to drive a screw therein, and FOREIGN PATENTS meansfor preventing reverse rotation of said 10 Number Country Date screwdriver while it is in engagement with a 3 5 7 Great Britain "0118 screwdriven into the shoe and heel.

EDWARD F. SMALL.

